Relative path to plugin script?

I'm writing a plugin that uses a script written in Groovy.

I store the script in ~/.vim/bin, and when the user presses a key, the
Groovy script is run by Vim. Everything worked great, until I
switched to using pathogen(1) for Vim, and now my script is stored in

~/.vim/bundle/myplugin/bin

so, Vim can't find ~/.vim/bin/myscript.groovy

I guess I'm looking for a more bullet proof way to set up Vim to call
the groovy script.

For example, calling something like this from myplugin.vim:

map <leader>f system(<this plugin's directory>/../bin/myplugin.groovy)

So, I need a way to find the directory where the plugin is being ran
from, so that
I can create an absolute path to <this plugin directory>/bin/myscript.groovy

Any ideas?

Thanks,
--Nate

(1) See http://tammersaleh.com/posts/the-modern-vim-config-with-pathogen

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